HP Color LaserJet 3550 Printer 600 x 600 dpi resolution, HP ImageREt 2,400 dpi effective resolution Up to 16 ppm print speed, first page in 22 seconds 64 MB built-in RAM; 350-sheet input capacity, expandable to 850 sheets Automatic media type sensing and print mode adjustment USB 2.0 interface, optional wireless networking; PC and Mac compatible